JP4280573B2 - Load drive device - Google Patents

Load drive device Download PDF

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Publication number
JP4280573B2
JP4280573B2 JP2003204762A JP2003204762A JP4280573B2 JP 4280573 B2 JP4280573 B2 JP 4280573B2 JP 2003204762 A JP2003204762 A JP 2003204762A JP 2003204762 A JP2003204762 A JP 2003204762A JP 4280573 B2 JP4280573 B2 JP 4280573B2
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Prior art keywords
control mode
inverter
voltage
motor
generator mg
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JP2005051894A (en
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貴史 山下
賢樹 岡村
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トヨタ自動車株式会社
株式会社デンソー
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/539Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency
    • H02M7/5395Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency by pulse-width modulation
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5387Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
    • H02M7/53871Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
    • H02M7/53875Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current with analogue control of three-phase output
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02PCONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P27/00Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
    • H02P27/04Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
    • H02P27/06Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02PCONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P29/00Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
    • H02P29/02Providing protection against overload without automatic interruption of supply
    • H02P29/032Preventing damage to the motor, e.g. setting individual current limits for different drive conditions
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02PCONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P2201/00Indexing scheme relating to controlling arrangements characterised by the converter used
    • H02P2201/09Boost converter, i.e. DC-DC step up converter increasing the voltage between the supply and the inverter driving the motor

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a load driving device, and more particularly to a load driving device capable of suppressing overcurrent.
[0002]
[Prior art]
Recently, hybrid vehicles and electric vehicles have attracted a great deal of attention as environmentally friendly vehicles. Some hybrid vehicles have been put into practical use.
[0003]
This hybrid vehicle is a vehicle that uses a DC power source, an inverter, and a motor driven by the inverter as a power source in addition to a conventional engine. In other words, a power source is obtained by driving the engine, a DC voltage from a DC power source is converted into an AC voltage by an inverter, and a motor is rotated by the converted AC voltage to obtain a power source. An electric vehicle is a vehicle that uses a DC power source, an inverter, and a motor driven by the inverter as a power source.
[0004]
In such hybrid vehicles and electric vehicles, it has been studied to drive a motor by boosting a DC voltage from a power source using a boost converter and converting the boosted DC voltage into an AC voltage.
[0005]
Patent Document 1 discloses that in a system including a converter that varies the input voltage to an inverter that drives a motor, the motor control mode is pulsed according to the input voltage to the inverter and the voltage necessary for motor control. Switching from the width modulation control mode (PWM control mode) to the rectangular wave control mode is disclosed.
[0006]
[Patent Document 1]
JP 2000-333465 A
[0007]
[Patent Document 2]
JP-A-10-66383
[0008]
[Patent Document 3]
JP-A-6-276609
[0009]
[Patent Document 4]
German Patent Application Publication No. 4013506A1
[0010]
[Problems to be solved by the invention]
However, when the motor is driven in the rectangular wave control mode while the DC voltage from the power supply is boosted and supplied to the inverter, there is a problem in that the amount of current taken from the power supply increases and an overcurrent is generated.
[0011]
Therefore, the present invention has been made to solve such a problem, and an object thereof is to provide a load driving device capable of suppressing overcurrent.
[0012]
[Means for Solving the Problems and Effects of the Invention]
According to the present invention, the load driving device includes an inverter, a voltage converter, and a control device. The inverter drives a load. The voltage converter performs voltage conversion between the power source and the inverter. When the control mode of the load is the rectangular wave control mode, the control device controls the inverter so as to drive the load by changing the control mode when receiving a boost operation command in the voltage converter.
[0013]
Preferably, the control device controls the inverter so as to drive the load by changing the control mode to the pulse width modulation control mode.
[0014]
Preferably, the control device further controls the inverter so as to drive the load while suppressing the torque command value.
[0015]
In the load driving device according to the present invention, when the boost operation of the voltage converter is instructed when the load control mode is the rectangular wave control mode, the control device performs overmodulation control mode or PWM other than the rectangular wave control mode. The inverter is controlled to switch to the control mode and drive the load.
[0016]
Therefore, according to the present invention, it is possible to reduce the carry-out of current from the power source and suppress the overcurrent from flowing through the load driving device.
[0017]
According to the invention, the load driving device includes an inverter, a voltage converter, and a control device. The inverter drives a load. The voltage converter performs voltage conversion between the power source and the inverter. When the control mode of the load is the rectangular wave control mode, the control device controls the inverter so as to drive the load while suppressing the torque command value when receiving a boost operation command in the voltage converter.
[0018]
In the load driving device according to the present invention, when the boosting operation of the voltage converter is commanded when the load control mode is the rectangular wave control mode, the control device drives the load while suppressing the torque command value. To control the inverter.
[0019]
Therefore, according to the present invention, it is possible to reduce the carry-out of current from the power source and suppress the overcurrent from flowing through the load driving device.
[0020]
Furthermore, according to the present invention, the load driving device includes an inverter, a voltage converter, and a control device. The inverter drives a load. The voltage converter performs voltage conversion between the power source and the inverter. The control device controls the inverter to drive the load in a control mode other than the rectangular wave control mode when the voltage converter is performing a boosting operation.
[0021]
In the load driving device according to the present invention, when the voltage converter is performing the boosting operation, the control device prohibits driving the load in the rectangular wave control mode.
[0022]
Therefore, according to the present invention, even when a delay occurs between when the boosting operation is commanded and when the boosting operation is actually started, current carry out from the voltage power source is reduced, and an overcurrent is generated in the load driving device. Flow can be suppressed.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and description thereof will not be repeated.
[0024]
FIG. 1 is a schematic block diagram of a load driving apparatus according to an embodiment of the present invention. Referring to FIG. 1, a load driving apparatus 100 according to an embodiment of the present invention includes a DC power supply B, system relays SR1 and SR2, voltage sensors 10 and 16, a boost converter 11, a capacitor 12, and an inverter 20 And a current sensor 24 and a control device 30.
[0025]
Boost converter 11 includes a reactor L1, NPN transistors Q1, Q2, and diodes D1, D2. Reactor L1 has one end connected to the power supply line of DC power supply B and the other end connected to the intermediate point between NPN transistor Q1 and NPN transistor Q2, that is, between the emitter of NPN transistor Q1 and the collector of NPN transistor Q2. Connected.
[0026]
NPN transistors Q1 and Q2 are connected in series between the power supply line of inverter 20 and the ground line. NPN transistor Q1 has a collector connected to the power supply line and an emitter connected to the collector of NPN transistor Q2. NPN transistor Q2 has an emitter connected to the ground line.
[0027]
Further, diodes D1 and D2 for flowing current from the emitter side to the collector side are connected between the collector and emitter of each NPN transistor Q1 and Q2.
[0028]
Inverter 20 includes a U-phase arm 21, a V-phase arm 22, and a W-phase arm 23. U-phase arm 21, V-phase arm 22, and W-phase arm 23 are provided in parallel between the power supply line and the earth line.
[0029]
U-phase arm 21 includes NPN transistors Q3 and Q4 connected in series, V-phase arm 22 includes NPN transistors Q5 and Q6 connected in series, and W-phase arm 23 includes NPN transistors connected in series. It consists of transistors Q7 and Q8. Further, diodes D3 to D8 that flow current from the emitter side to the collector side are connected between the collectors and emitters of the NPN transistors Q3 to Q8, respectively.
[0030]
An intermediate point of each phase arm is connected to each phase end of each phase coil of motor generator MG. That is, motor generator MG is a three-phase permanent magnet motor, and is configured such that one end of three coils of U, V, and W phases is commonly connected to the middle point, and the other end of U-phase coil is NPN transistor Q3. The other end of the V-phase coil is connected to the intermediate point of NPN transistors Q5 and Q6, and the other end of the W-phase coil is connected to the intermediate point of NPN transistors Q7 and Q8, respectively.
[0031]
The DC power source B is composed of a secondary battery such as nickel hydride or lithium ion. DC power supply B supplies a DC voltage to boost converter 11 via system relays SR1 and SR2.
[0032]
System relays SR1 and SR2 are turned on / off by a signal SE from control device 30.
[0033]
Voltage sensor 10 detects DC voltage Vb output from DC power supply B, and outputs the detected DC voltage Vb to control device 30.
[0034]
Boost converter 11 boosts the DC voltage output from DC power supply B based on signal PWMU from control device 30 and supplies the boosted voltage to capacitor 12. Boost converter 11 steps down the DC voltage supplied from inverter 20 based on signal PWMD from control device 30 and supplies it to DC power supply B.
[0035]
Capacitor 12 smoothes the DC voltage supplied from boost converter 11 and supplies it to inverter 20.
[0036]
The voltage sensor 16 detects the voltage Vm across the capacitor 12 and outputs the detected voltage Vm to the control device 30.
[0037]
Inverter 20 converts DC voltage supplied from boost converter 11 via capacitor 12 into AC voltage based on signal PWMI from control device 30 to drive motor generator MG. Further, inverter 20 converts the AC voltage generated by motor generator MG into a DC voltage based on signal PWMC from control device 30, and supplies the converted DC voltage to boost converter 11 via capacitor 12.
[0038]
Current sensor 24 detects motor current MCRT flowing through motor generator MG, and outputs the detected motor current MCRT to control device 30.
[0039]
The control device 30 sets the DC voltage Vb from the voltage sensor 10, the voltage Vm from the voltage sensor 16, the motor rotational speed MRN and the torque command value TR from an ECU (Electrical Control Unit) provided outside the load driving device 100. Based on this, signal PWMU or signal PWMD is generated by a method described later, and the generated signal PWMU or signal PWMD is output to boost converter 11.
[0040]
Further, control device 30 generates signal PWMI or signal PWMC by a method described later based on voltage Vm from voltage sensor 16, motor current MCRT from current sensor 24, and torque command value TR from an external ECU, The generated signal PWMI or signal PWMC is output to the inverter 20.
[0041]
Signal PWMI is a control signal for driving motor generator MG in the power running mode, and signal PWMC is a control signal for driving motor generator MG in the regeneration mode.
[0042]
When the control device 30 generates the signal PWMI, the control mode of the motor generator MG is referred to as a pulse width modulation control mode (hereinafter referred to as “PWM control mode”, the same applies hereinafter), an overmodulation control mode, and a rectangular shape. When the boosting operation of boost converter 11 is instructed when it is determined whether the control mode of motor generator MG is the rectangular wave control mode, the control mode of motor generator MG is changed. Inverter 20 is controlled to switch to overmodulation control mode or PWM control mode to drive motor generator MG.
[0043]
The signal PWMI includes a signal PWMI_P, a signal PWMI_M, and a signal PWMI_K. The signal PWMI_P is a control signal for driving the motor generator MG in the PWM control mode, and the signal PWMI_M drives the motor generator MG in the overmodulation control mode. The signal PWMI_K is a control signal for driving the motor generator MG in the rectangular wave control mode.
[0044]
Therefore, control device 30 generates signal PWMI_P or PWMI_M and outputs it to inverter 20 when the boosting operation of boost converter 11 is commanded while outputting signal PWMI_K to inverter 20.
[0045]
Control device 30 prohibits motor generator MG from being driven in the rectangular wave control mode when boost converter 11 is performing a boost operation. In other words, control device 30 outputs signal PWMI_P or signal PWMI_M to inverter 20 to drive motor generator MG in the PWM control mode or the overmodulation control mode when boosting converter 11 is performing a boosting operation. To control.
[0046]
FIG. 2 is a functional block diagram showing functions related to control of boost converter 11 and inverter 20 among the functions of control device 30 shown in FIG. Referring to FIG. 2, control device 30 includes inverter control means 301 and converter control means 302. Based on torque command value TR, motor current MCRT, and voltage Vm (corresponding to “inverter input voltage” to inverter 20; the same applies hereinafter), inverter control means 301 generates signal PWMI or signal PWMC by a method described later. And output to the NPN transistors Q3 to Q8 of the inverter 20.
[0047]
When inverter control means 301 receives signal UP from converter control means 302 and determines that the control mode of motor generator MG is the rectangular wave control mode, it generates signal PWMI_P or signal PWMI_M to generate NPN of inverter 20. Output to transistors Q3 to Q8.
[0048]
Further, inverter control means 301 generates signal PWMI_P or PWMI_M and outputs it to NPN transistors Q3 to Q8 of inverter 20 when signal UP is received from converter control means 302 regardless of the control mode of motor generator MG.
[0049]
Converter control means 302 determines whether or not the boost operation of boost converter 11 is commanded based on torque command value TR and motor rotation speed MRN.
[0050]
When converter control means 302 determines that the boost operation of boost converter 11 has been commanded, it generates signal UP and outputs it to inverter control means 301.
[0051]
Further, converter control means 302 generates signal PWMU or signal PWMD by a method described later based on torque command value TR, motor rotational speed MRN, DC voltage Vb and voltage Vm, and NPN transistors Q1, Q2 of boost converter 11. Output to.
[0052]
FIG. 3 is a functional block diagram of the inverter control means 301 shown in FIG. Referring to FIG. 3, inverter control means 301 includes a motor control phase voltage calculation unit 31, an inverter PWM signal conversion unit 32, and a motor control unit 36.
[0053]
Motor control phase voltage calculation unit 31 receives inverter input voltage Vm to inverter 20 from voltage sensor 16, receives motor current MCRT flowing through each phase of motor generator MG from current sensor 24, and receives torque command value TR as an external ECU. Receive from. The motor control phase voltage calculation unit 31 calculates the voltage Vac to be applied to the coils of each phase of the motor generator MG based on these input signals, and the calculated result Vac is converted into an inverter PWM signal. Output to the unit 32 and the motor control unit 36.
[0054]
Based on the calculation result Vac received from the motor control phase voltage calculation unit 31, the inverter PWM signal conversion unit 32 generates a signal PWMI or a signal PWMC that actually turns on / off the NPN transistors Q3 to Q8 of the inverter 20. Then, the generated signal PWMI or signal PWMC is output to each of the NPN transistors Q3 to Q8.
[0055]
More specifically, when receiving the signal EXC from the motor control unit 36, the inverter PWM signal conversion unit 32 generates the signal PWMI_P or the signal PWMI_M based on the calculation result Vac received from the motor control phase voltage calculation unit 31. And output to NPN transistors Q3 to Q8. Further, when the inverter PWM signal conversion unit 32 does not receive the signal EXC from the motor control unit 36, any one of the signal PWMI_P, the signal PWMI_M, and the signal PWMI_K based on the calculation result Vac received from the motor control phase voltage calculation unit 31. Is generated and output to the NPN transistors Q3 to Q8.
[0056]
Thereby, each of the NPN transistors Q3 to Q8 is subjected to switching control, and controls the current flowing through each phase of the motor generator MG so that the motor generator MG outputs the commanded torque. In this way, the motor drive current is controlled, and a motor torque corresponding to the torque command value TR is output.
[0057]
NPN transistors Q3 to Q8 switch the control mode to the PWM control mode or the overmodulation control mode when the control mode of motor generator MG is the rectangular wave control mode and boost converter 11 is performing the boost operation. To drive the motor generator MG.
[0058]
Further, NPN transistors Q3 to Q8 drive motor generator MG in the PWM control mode or the overmodulation control mode even when the voltage utilization rate is high when boosting converter 11 is performing the boosting operation.
[0059]
Motor controller 36 receives voltage Vac applied to motor generator MG from motor control phase voltage calculator 31 and voltage Vm from voltage sensor 16. The motor control unit 36 calculates the voltage utilization rate k by dividing the voltage Vac by the voltage Vm.
[0060]
Then, motor control unit 36 determines whether the control mode of motor generator MG is the PWM control mode, the overmodulation control mode, or the rectangular wave control mode based on the calculated voltage utilization factor k.
[0061]
More specifically, when the voltage usage rate k is 0.61, the motor control unit 36 determines that the control mode of the motor generator MG is the PWM control mode, and the voltage usage rate k is 0.75. At this time, it is determined that the control mode of the motor generator MG is the overmodulation control mode, and when the voltage utilization factor k is 0.78, the control mode of the motor generator MG is determined to be the rectangular wave control mode.
[0062]
When the motor control unit 36 determines that the control mode of the motor generator MG is the rectangular wave control mode, when receiving the signal UP from the converter control unit 302, the motor control unit 36 generates a signal EXC and generates an inverter PWM signal conversion unit. To 32. Further, when the motor control unit 36 determines that the control mode of the motor generator MG is the PWM control mode or the overmodulation control mode, the motor control unit 36 does not generate the signal EXC even when receiving the signal UP from the converter control unit 302.
[0063]
Furthermore, regardless of the control mode of motor generator MG, when receiving signal UP from converter control means 302, motor control unit 36 generates signal EXC and outputs it to inverter PWM signal conversion unit 32.
[0064]
Whether the operation mode of motor generator MG is the power running mode or the regeneration mode is determined by the relationship between torque command value TR and motor rotational speed MRN. In the Cartesian coordinates, when the horizontal axis is the motor rotational speed MRN and the vertical axis is the torque command value TR, the motor generator is generated when the relationship between the torque command value TR and the motor rotational speed MRN exists in the first and second quadrants. The operation mode of MG is a power running mode, and when the relationship between torque command value TR and motor rotational speed MRN exists in the third and fourth quadrants, the operation mode of motor generator MG is the regeneration mode.
[0065]
Therefore, when receiving a positive torque command value TR, inverter control means 301 generates a signal PWMI (consisting of signals PWMI_P, PWMI_M, PWMI_K) for driving motor generator MG as a drive motor, and NPN transistors Q3-Q8. When a negative torque command value TR is received, a signal PWMC for driving motor generator MG in the regeneration mode is generated and output to NPN transistors Q3 to Q8.
[0066]
FIG. 4 is a functional block diagram of converter control means 302 shown in FIG. Referring to FIG. 4, converter control means 302 includes a voltage command calculation unit 33, a converter duty ratio calculation unit 34, and a converter PWM signal conversion unit 35.
[0067]
Voltage command calculation unit 33 calculates the optimum value (target value) of the inverter input voltage, that is, voltage command value Vdc_com of boost converter 11 based on torque command value TR and motor rotation speed MRN from the external ECU. Voltage command calculation unit 33 determines whether or not the boost operation of boost converter 11 is commanded based on calculated voltage command value Vdc_com.
[0068]
More specifically, the voltage command calculation unit 33 determines whether the boost operation of the boost converter 11 is commanded by determining whether the calculated voltage command value Vdc_com is larger than the previous voltage command value. judge. When the voltage command calculation unit 33 determines that the boosting operation of the boost converter 11 is commanded, the voltage command calculation unit 33 generates a signal UP and outputs the signal UP to the inverter control unit 301, and outputs the calculated voltage command value Vdc_com to the converter duty. It outputs to the calculating part 34.
[0069]
The converter duty ratio calculation unit 34 converts the voltage Vm into the voltage command Vdc_com based on the voltage command Vdc_com from the voltage command calculation unit 33, the DC voltage Vb from the voltage sensor 10, and the voltage Vm from the voltage sensor 16. The duty ratio for setting is calculated, and the calculated duty ratio is output to the converter PWM signal converter 35.
[0070]
Converter PWM signal converter 35 generates signal PWMU or signal PWMD for turning on / off NPN transistors Q1 and Q2 of boost converter 11 based on the duty ratio from converter duty ratio calculator 34, and generates the signal PWMD. The signal PWMU or the signal PWMD is output to the NPN transistors Q1 and Q2 of the boost converter 11.
[0071]
Note that increasing the on-duty of the NPN transistor Q2 on the lower side of the boost converter 11 increases the power storage in the reactor L1, so that a higher voltage output can be obtained. On the other hand, increasing the on-duty of the upper NPN transistor Q1 reduces the voltage of the power supply line. Therefore, by controlling the duty ratio of the NPN transistors Q1 and Q2, it is possible to control the voltage of the power supply line to an arbitrary voltage higher than the output voltage of the DC power supply B.
[0072]
FIG. 5 is a diagram showing the relationship between the output voltage Vac of the inverter and the rotational speed of the motor. Referring to FIG. 5, the relationship between output voltage Vac of inverter 20 and motor rotation speed MRN is shown by curve k1. The output voltage Vac increases in proportion to the rotational speed MRN when the motor rotational speed MRN is in the range of 0 to MRN2, and is constant when the motor rotational speed MRN is greater than or equal to the rotational speed MRN2.
[0073]
A curve k1 shows a region RGE1 where the motor rotational speed MRN is in the range of 0 to MRN1, a region RGE2 where the motor rotational speed MRN is in the range of MRN1 to MRN2, and a region RGE3 where the motor rotational speed MRN is greater than or equal to MRN2. And divided.
[0074]
When the relationship between output voltage Vac and motor rotational speed MRN exists in region RGE1, the control mode of motor generator MG is the PWM control mode, and the relationship between output voltage Vac and motor rotational frequency MRN is in the region. When present in RGE2, the control mode of motor generator MG is the overmodulation control mode, and when the relationship between output voltage Vac and motor rotational speed MRN exists in region RGE3, the control mode of motor generator MG is rectangular. Wave control mode.
[0075]
For example, the motor control unit 36 changes the voltage utilization factor k to 0.61, 0.75, and 0.78, and outputs the output voltages Vac (Vac (0.61), Vac (0.75) according to Vac = Vm × k. ), Vac (0.78)). k = 0.61 is a voltage utilization factor when the control mode of the motor generator MG is the PWM control mode, and k = 0.75 is a voltage when the control mode of the motor generator MG is the overmodulation control mode. It is a utilization factor, and k = 0.78 is a voltage utilization factor when the control mode of the motor generator MG is the rectangular wave control mode. Then, the motor control unit 36 determines which of the three calculated output voltages Vac, the relationship between the output voltage Vac and the motor rotational speed MRN exists on the curve k1.
[0076]
When the relationship between the output voltage Vac (0.61) and the motor rotational speed MRN exists on the curve k1, that is, when the relationship between the output voltage Vac (0.61) and the motor rotational speed MRN exists in the region RGE1. The motor control unit 36 determines that the control mode of the motor generator MG is the PWM control mode. Further, when the relationship between the output voltage Vac (0.75) and the motor rotational speed MRN exists on the curve k1, that is, the relationship between the output voltage Vac (0.75) and the motor rotational speed MRN exists in the region RGE2. When doing so, the motor control unit 36 determines that the control mode of the motor generator MG is the overmodulation control mode. Further, when the relationship between output voltage Vac (0.78) and motor rotational speed MRN exists on curve k1, that is, the relationship between output voltage Vac (0.78) and motor rotational speed MRN exists in region RGE3. When doing so, the motor control unit 36 determines that the control mode of the motor generator MG is the rectangular wave control mode.
[0077]
Motor controller 36 holds curve k1 as a map, and determines the control mode of motor generator MG based on output voltage Vac and motor rotation speed MRN with reference to the map.
[0078]
Therefore, when the motor speed MRN of the motor generator MG changes, the motor control unit 36 determines the control mode of the motor generator MG based on the map described above.
[0079]
FIG. 6 is a timing chart of voltage command value Vdc_com, torque command value TR, and control mode. The operation of the load driving device 100 will be described with reference to FIG.
[0080]
Before boost converter 11 performs the boost operation, voltage command value Vdc_com matches DC voltage Vb, and motor generator MG is driven in the PWM control mode. In order to reduce the voltage utilization rate of motor generator MG and suppress the carry-out of current from DC power supply B, voltage command value Vdc_com is increased along straight line k2 between timing t1 and timing t4. Good. However, in actuality, the voltage command value Vdc_com is increased along the straight line k3 from timing t3 to timing t4 in consideration of efficiency.
[0081]
In this case, the torque command value TR increases linearly from timing t2 to timing t4. Further, the control mode of motor generator MG is switched in the order of PWM control mode, overmodulation control mode, and rectangular wave control mode with the passage of time.
[0082]
Then, boost converter 11 starts the boost operation at timing t3 when motor generator MG is driven in the rectangular wave control mode. Since the rectangular wave control mode is a control mode for controlling the current that flows to the motor generator MG in synchronization with the rising and falling of one pulse, when the current that flows to the motor generator MG is controlled at the rising of one pulse, The current flowing through motor generator MG cannot be controlled until the next falling timing. As a result, when the motor generator MG is driven in the rectangular wave control mode, the amount of current taken from the DC power supply B increases. This tendency is particularly noticeable when the boost converter 11 is performing a boost operation. As a result, an overcurrent may flow through the load driving device 100.
[0083]
In order to avoid such a situation, in the present invention, when boost converter 11 starts the boosting operation at timing t3 when motor generator MG is driven in the rectangular wave control mode, the control mode is changed to rectangular wave control mode. Is switched to the overmodulation control mode or the PWM control mode to drive the motor generator MG.
[0084]
Compared to the rectangular wave control mode, the overmodulation control mode and the PWM control mode have more timing for controlling the current flowing to the motor generator MG, and therefore the current flowing to the motor generator MG according to the voltage level supplied from the boost converter 11. You can control the amount. As a result, the amount of current taken from the DC power source B is reduced, and overcurrent can be prevented from flowing through the load driving device 100.
[0085]
Preferably, the control mode is switched from the rectangular wave control mode to the PWM control mode at timing t3. As a result, it is possible to further reduce the amount of current taken from the DC power supply B compared to the case of switching to the overmodulation control mode, and further suppress the overcurrent from flowing to the load driving device 100.
[0086]
FIG. 7 is another timing chart of the voltage command value Vdc_com, the torque command value TR, and the control mode. Referring to FIG. 7, at time t3 when motor generator MG is driven in the rectangular wave control mode, when boost converter 11 starts the boost operation, the control mode of motor generator MG is changed to the overmodulation control mode or the PWM control mode. The torque command value TR is suppressed while being switched.
[0087]
That is, when voltage command calculation unit 33 of converter control means 302 receives torque command value TR from the external ECU after timing t3, the increase rate of torque command value TR is higher than the increase rate of torque command value TR before timing t3. The torque command value TR is determined so as to decrease, and the voltage command value Vdc_com is calculated. That is, the voltage command calculation unit 33 determines the torque command value TR so as to increase along the straight line k4 after the timing t3, and calculates the voltage command value Vdc_com.
[0088]
Therefore, after timing t3, motor generator MG is driven to output suppressed torque command value TR in the overmodulation control mode or the PWM control mode.
[0089]
As a result, the carry-out of current from the DC power supply B is further reduced, and it is possible to further suppress the overcurrent from flowing in the load driving device 100.
[0090]
The timing for suppressing the torque command pair TR may not be the same as the timing for switching from the rectangular wave control mode to the overmodulation control mode or the PWM control mode.
[0091]
FIG. 8 is still another timing chart of the voltage command value, the torque command value, and the control mode. Referring to FIG. 8, when boost converter 11 starts a boost operation at timing t3 when motor generator MG is driven in the rectangular wave control mode, torque command value TR is suppressed.
[0092]
That is, when the voltage command calculation unit 33 of the converter control means 302 receives the torque command value TR from the external ECU after the timing t3, it determines the torque command value TR so as to increase along the straight line k4, and the voltage command value Vdc_com. Is calculated.
[0093]
In this case, the control mode of motor generator MG is not switched and the rectangular wave control mode is maintained.
[0094]
Therefore, after timing t3, motor generator MG is driven to output suppressed torque command value TR in the rectangular wave control mode.
[0095]
Thereby, the carry-out of the current from the DC power supply B is reduced, and it is possible to suppress the overcurrent from flowing in the load driving device 100.
[0096]
As described above, when the control mode of motor booster 11 is commanded when control mode of motor generator MG is the rectangular wave control mode, control device 30
(A) Switching from rectangular wave control mode of motor generator MG to overmodulation control mode or PWM control mode
(B) Switching from rectangular wave control mode of motor generator MG to overmodulation control mode or PWM control mode and suppression of torque command value TR
(C) Suppression of torque command value TR
The inverter 20 is controlled so as to drive the motor generator MG.
[0097]
Control device 30 also sets the control mode of motor generator MG to the rectangular wave control mode when the boost operation of boost converter 11 is commanded when the control mode of motor generator MG is the PWM control mode or the overmodulation control mode. Switching is prohibited. That is, when boosting operation of boost converter 11 is commanded, control device 30 inhibits output of signal PWMI_K to inverter 20, generates signal PWMI_P or signal PWMI_M, and outputs the signal to inverter 20.
[0098]
As described above, when the boost converter 11 starts the boost operation when the control mode of the motor generator MG is the PWM control mode or the overmodulation control mode, the motor generator MG is prohibited from being driven in the rectangular wave control mode. The reason is as follows.
[0099]
When the boosting operation of boost converter 11 is commanded, control device 30 generates signal PWMU by the above-described method based on torque command value TR and motor rotation speed MRN, and sends the signal PWMU to NPN transistors Q1 and Q2 of boost converter 11. Output. NPN transistors Q1 and Q2 perform a switching operation in response to signal PWMU from control device 30, and boost converter 11 starts a boost operation.
[0100]
As described above, since there is a certain delay from when the boosting operation of the boosting converter 11 is commanded until the boosting converter 11 actually starts the boosting operation, at the timing when the boosting converter 11 actually starts the boosting operation. It is also assumed that the control mode of motor generator MG is switched to the rectangular wave control mode.
[0101]
Therefore, when the boost operation of boost converter 11 is commanded, driving motor generator MG in the rectangular wave control mode is prohibited.
[0102]
Note that the load driving device 100 is mounted on a hybrid vehicle or an electric vehicle, and drives drive wheels of the hybrid vehicle or the electric vehicle.
[0103]
For example, when load drive device 100 is mounted on a hybrid vehicle, motor generator MG includes two motor generators MG1 and MG2. Motor generator MG1 is connected to the engine via a power split mechanism, starts the engine, and generates power by the rotational force of the engine. Motor generator MG2 is connected to the front wheels (drive wheels) via a power split mechanism, drives the front wheels, and generates power by the rotational force of the front wheels.
[0104]
When load driving device 100 is mounted on an electric vehicle, motor generator MG is connected to the front wheels (drive wheels), drives the front wheels, and generates power by the rotational force of the front wheels.
[0105]
Then, control device 30 of load drive device 100 determines the control mode of motor generator MG while the hybrid vehicle or the electric vehicle is running and stopped, and when the control mode of motor generator MG is the rectangular wave control mode. When the boosting operation of boost converter 11 is commanded, inverter 20 is controlled to drive motor generator MG by any one of (A), (B), and (C) described above.
[0106]
Therefore, in a hybrid vehicle or an electric vehicle equipped with the load driving device 100, it is possible to suppress an overcurrent from flowing.
[0107]
In the above description, the load driving device 100 has been described as driving one motor generator MG. However, in the present invention, the load driving device 100 may drive a plurality of motor generators. In this case, a plurality of inverters are provided corresponding to the plurality of motor generators, and the plurality of inverters are connected in parallel to both ends of the capacitor 12. When the boosting operation of boost converter 11 is commanded when at least one of the plurality of motor generators is driven in the rectangular wave control mode, control device 30 causes (A), (A A plurality of inverters are controlled so as to drive a plurality of motor generators by either B) or (C).
[0108]
Therefore, it is possible to suppress the overcurrent from flowing in the load driving device that drives the plurality of motor generators.
[0109]
The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiment but by the scope of claims for patent, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims for patent.
[Brief description of the drawings]
FIG. 1 is a schematic block diagram of a load driving device according to an embodiment of the present invention.
FIG. 2 is a functional block diagram showing functions related to control of a boost converter and an inverter among the functions of the control device shown in FIG. 1;
FIG. 3 is a functional block diagram of inverter control means shown in FIG. 2;
4 is a functional block diagram of converter control means shown in FIG. 2. FIG.
FIG. 5 is a diagram showing a relationship between an output voltage of an inverter and a rotation speed of a motor.
FIG. 6 is a timing chart of a voltage command value, a torque command value, and a control mode.
FIG. 7 is another timing chart of the voltage command value, the torque command value, and the control mode.
FIG. 8 is still another timing chart of a voltage command value, a torque command value, and a control mode.
[Explanation of symbols]
10, 16 Voltage sensor, 11 Boost converter, 12 Capacitor, 20 Inverter, 21 U-phase arm, 22 V-phase arm, 23 W-phase arm, 24 Current sensor, 30 Controller, 31 Motor control phase voltage calculation unit, 32 Inverter PWM signal conversion unit, 33 voltage command calculation unit, 34 converter duty ratio calculation unit, 35 converter PWM signal conversion unit, 36 motor control unit, 100 load drive device, 301 inverter control unit, 302 converter control unit, B DC Power supply, L1 reactor, Q1-Q8 NPN transistor, D1-D8 diode, SR1, SR2 System relay.

Claims (4)

  1. An inverter driving the load;
    A voltage converter that performs voltage conversion between a power source and the inverter;
    When the control mode of the load is a rectangular wave control mode, when receiving a boosting operation command in the voltage converter, the control mode is switched to either an overmodulation control mode or a pulse width modulation control mode. And a control device for controlling the inverter so as to drive the load.
  2.   The load driving device according to claim 1, wherein the control device controls the inverter to drive the load by changing the control mode to a pulse width modulation control mode.
  3.   The load driving device according to claim 1, wherein the control device further controls the inverter so as to drive the load while suppressing a torque command value.
  4. An inverter driving the load;
    A voltage converter that performs voltage conversion between a power source and the inverter;
    When the load control mode is a rectangular wave control mode, a control device that controls the inverter so as to drive the load while suppressing a torque command value when receiving a command for a boost operation in the voltage converter A load driving device comprising:
JP2003204762A 2003-07-31 2003-07-31 Load drive device Active JP4280573B2 (en)

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JP2003204762A JP4280573B2 (en) 2003-07-31 2003-07-31 Load drive device
EP04747713A EP1649590B1 (en) 2003-07-31 2004-07-12 Load driver capable of suppressing overcurrent
CNB2004800219742A CN100514825C (en) 2003-07-31 2004-07-12 Load driver capable of suppressing overcurrent
DE602004017010T DE602004017010D1 (en) 2003-07-31 2004-07-12 Load driver that is able to suppress overtime
US10/560,088 US7417393B2 (en) 2003-07-31 2004-07-12 Load driver capable of suppressing overcurrent
PCT/JP2004/010249 WO2005013473A1 (en) 2003-07-31 2004-07-12 Load driver capable of suppressing overcurrent

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US7417393B2 (en) 2008-08-26
US20060119297A1 (en) 2006-06-08
CN1830134A (en) 2006-09-06
CN100514825C (en) 2009-07-15
JP2005051894A (en) 2005-02-24
EP1649590A1 (en) 2006-04-26
WO2005013473A1 (en) 2005-02-10
DE602004017010D1 (en) 2008-11-20

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